linux-kernel - [PATCH v2 3/4] KVM: arm/arm64: check vgic

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Date:	Thu,  4 Dec 2014 10:48:03 +0100
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	christoffer.dall@...aro.org, marc.zyngier@....com,
	andre.przywara@....com, linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
	alex.williamson@...hat.com, agraf@...e.de, gleb@...nel.org,
	pbonzini@...hat.com
Cc:	linux-kernel@...r.kernel.org, patches@...aro.org,
	will.deacon@....com, a.motakis@...tualopensystems.com
Subject: [PATCH v2 3/4] KVM: arm/arm64: check vgic_initialized before VCPU creation

Now that user-space can initiate VGIC initialization independently
on the first vcpu run, let's check the user-space does not attempt
to create a VCPU after this initialization.

Signed-off-by: Eric Auger <eric.auger@...aro.org>
---
 arch/arm/kvm/arm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index b5401f7..edcc66b 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -216,6 +216,11 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	int err;
 	struct kvm_vcpu *vcpu;
 
+	if (unlikely(vgic_initialized(kvm))) {
+		err = -EBUSY;
+		goto out;
+	}
+
 	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 	if (!vcpu) {
 		err = -ENOMEM;
-- 
1.9.1

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